energy efficiency

Repair Double Glazing: The Good, The Bad, And The Ugly

7 min read

How to Repair Double Glazing

Double-glazed windows are strong and secure, however they will wear out with time. Double glazing that requires repair can be detected by the feeling of draught in the window panes or condensation.

The seal that holds the glass panes in place has usually broken. This can be repaired with the reseal.


The seals used with double glazing are a crucial component of the overall insulation and energy efficiency of the windows. They are situated between the glass panes of uPVC frames and provide an airtight shield that helps to keep out wind and rain as well as condensation and drafts that can cause damp on the walls and window replacement near me sills. Additionally, the window replacement seals aid in keeping warm air in and cold out which can significantly reduce heating bills.

It is not unusual for window seals to develop defects. This is often due to weathering and exposure to extreme elements such as high winds rain, ice, and snow. However, it could be due to improper installation or the use of chemicals such as paint strippers that harm the rubber.

When the window seals fail it could cause moisture and humidity can get trapped between the glass panes, causing fogging or misting of windows. It can also affect the insulation properties of the double glazing since it no longer has the gas inert between the panes that assists in retaining heat.

It’s possible to carry out some DIY double glazed window seal repairs if are aware of what to look for. It is recommended to hire professionals to do the job. They can reseal the windows to restore their insulation and energy efficient properties and also eliminate any unattractive condensation that has developed between the glass panes.

Many double-glazed windows are covered by a warranty which means that they can be repaired or replaced without cost to the homeowner. Check the paperwork that came along with your double glazing, or contact the company where you bought it to find out whether there is any assistance available. It’s also worth checking your home insurance policy to be sure you’re covered for any issues with double glazing. If you have insurance and you have a claim, it’s crucial to make claims as soon as you can to avoid costly costs. You can also consult your local authority’s Building Control department for further guidance and assistance.


Double glazing isn’t indestructible and issues with it can develop. The most common issue is misting. This happens when the seal cracks between two panes, and moisture builds up. It is possible to fix misted double glazing, without having to replace the entire window. It is possible to fix it by removing the affected glass, blowing air in the gap, and then creating a seal.

Double glazed windows can be made from a wide range of glass. Some of it is plain, like mirrors or safety glass which is tempered to increase its strength and safety features. Some types of glass have coatings applied to enhance their properties. This can include solar control glass, which reduces glare and stops heat transfer; extra-clean glass that is stain-resistant and self-cleaning and chromogenic glass that changes transparency based on temperature.

Double-glazed units with high efficiency are also available from certain manufacturers. These units use insulated glass and special films to maintain the internal temperature, so that cooling and heating systems don’t need to be as laborious.

They are usually cheaper than replacing windows, and can help you save a lot of energy. However, they do require regular maintenance due to the technologies they incorporate can wear out over time.

As soon as you discover an issue, it is essential to contact the business where you purchased your double glazing. Contact them by phone, then follow up with a written letter or an email. This will provide proof that you’ve informed them about the problem and that you and them agreed to address the issue. If you want to claim any warranty it is essential to do this. Many companies offer 10- or 20-year guarantees, while some give lifetime warranties.


The frames that support double glazing are made from materials like plastic and wood that can be damaged by a variety different ways. Damaged frames can allow cold air to seep into your home, which will increase your heating costs. Frames can also get bent, twisted, Double Glazing and discolored over time. It is possible to replace them, or Double Glazing at a minimum remove the sand and paint to bring them back to their original appearance.

If you’re having trouble with the frames of your windows, it is recommended that you call a glazier for help since they have the experience and equipment required to carry out this type of repair. It is possible to do some repairing yourself but it is generally much quicker and more cost-effective to seek out professional advice. A qualified glazier who is trained to complete the work will ensure that the repair is done correctly and you are able to get reimbursement for any costs.

Condensation between glass panes is a common indication that double glazing needs repair. This is usually a sign that the seal has failed and allows air to move between the panes. This can cause the moisture to fall, making your home feel humid. It is a good idea to have this repaired as soon as possible to avoid further problems.

It is not always necessary to replace the whole window, as long as it isn’t cracked or broken. The frame could be in good condition, so it is more efficient to replace the glass inside the window.

Many companies will provide the same day repair for double glazing however, it is essential to know what you require before you ask for a price. Sales reps are known to try to convince people to purchase more expensive repairs than they actually require. It is a good idea to know what you need and how much it will cost, and why you should it so that you can identify a high-pressure sales strategy.

Double-glazing should be examined every couple of years to make sure they are in good working condition and to avoid issues. If you do need repairs it is recommended that you seek out a reputable company to get an estimate as they have the experience and knowledge required to resolve your problems quickly and effectively.


A reliable tradesperson will put a window lock regardless of whether you’re installing new windows or repairing double glazing. The installer should go over the various locking systems that are available as part of the quote and the one that best fits your living arrangements and the local crime rate. Espagnolette is a popular option that utilizes mushroom-headed bolts that are inserted behind locking positions on the frame. They are typically used on uPVC but they can also be added to aluminum and wood.

Other locks are designed to limit the number of times windows can open. If yours is a casement type window, you might want to consider installing a Canzak Window Restriction Cable which works like a chain lock for a door and can be secured to either side of the opening to prevent it from opening too far. It’s also easy to fit and is among the few types of locks that can be used on casements.

A hinged wedge lock could be used to prevent the lower sash of windows that are sash from being lifted enough to allow an intruder to gain access. Cut a strip of wood to the length of the channel that operates the lower sash. Fit it in, and tack it to the wall and frame.

You can also add a sash or casement lock. They are more durable than latch locks and are typically used in conjunction with them to ensure the security of windows. These are located on the outside of windows and can be used on double and single-hung windows as well as sliding ones.

Other ways to improve the security of your double-glazed windows are adding the shoot bolt lock system. These locks are made by shooting bolts from both ends to create a sturdy lock. These are typically offered as an upgrade and are suitable for commercial and domestic use.

Verify that your double-glazing installer is accredited by an industry body such as Checkatrade to ensure that they have the knowledge and experience to perform top-quality work in line with their standards.

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